Hornady vs Whidden HS comparator gauge
- Thread starter p5200
- Start date
Dusty Stevens
Shiner
The reamer print should tell you the shoulder datum diameter, however you can use anything from a empty pistol case to the wrong size comparator insert so long as you use the same thing itll work fine. To answer your question whidden usually includes the correct comparator diameter
Dusty Stevens
Shiner
I think hes talking about the comparator that comes with the dies. That case gage is a very nice piece and is in fact zeroed on a go gage
RegionRat
Gold $$ Contributor
Oops, right Dusty, I forgot about those. I even have several that came in die sets and never used them.
Both kinds, for basic shoulder datum length measurement.
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jepp2
Gold $$ Contributor
Hornady is wrong. Check the SAAMI print and it calls for the 0.400" at the datum line.
It really doesn’t matter as it’s a comparator, for comparison uses you don’t need the exact datum point.
Does the 308 Winchester use the same 0.400 gauge?
jepp2
Gold $$ Contributor
RegionRat
Gold $$ Contributor
As long as you are aware of the comparator dimension laying well away from the shoulder to body or neck to shoulder, and always use the same basis of comparison, you can run.
The point of using the 0.400 diameter, is to try and match the datum used for headspace gages. Some Go-No-Go gages have a wide contact area, some don’t. If you ever wanted to check your ammo compared to a Go-Gage, then try and stick with the 0.400 value to have a better chance of touching on the gage. If you never plan to do that, then carry on and don’t worry.
The point of using the 0.400 diameter, is to try and match the datum used for headspace gages. Some Go-No-Go gages have a wide contact area, some don’t. If you ever wanted to check your ammo compared to a Go-Gage, then try and stick with the 0.400 value to have a better chance of touching on the gage. If you never plan to do that, then carry on and don’t worry.
I was recently “burned” by the Hornady recommendations. The actually recommend using a gauge size about half way between the shoulder max and min. Found that on their website.
“Determining the proper bushing diameter: If you add the neck diameter and the shoulder diameter and divide that number by two, use the bushing closest to that number.”
It really doesn’t matter as long as the same size bushing is used each time.
“Determining the proper bushing diameter: If you add the neck diameter and the shoulder diameter and divide that number by two, use the bushing closest to that number.”
It really doesn’t matter as long as the same size bushing is used each time.
Last edited:
Dusty Stevens
Shiner
In your loading notes all you gotta do is list which bushing you use for measurement and itll be easy to return to your measurement
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